Window film, ventilation and mould

[OnTheRanDan]

I've only got my heating coming on for an hour morning and night. The weather means I'm drying all the washing indoors on racks but I do have two dehumidifiers on the go most of the day.
There is a lot of condensation on the upstairs bedroom windows, they are also draughty and get mouldy too around the frames. They are upvc. There is also some evidence of mould forming at the back of furniture.
So my questions are- is it going to exacerbate the mould problem putting film over the windows as we won't be able to open windows for ventilation?
Or will the film help because condensation will not form against the cold glass and therefore stop mould forming on the frames?
If the film stops the draughts and the room is therefore warmer will this offset the humidity and mould issues?
And
Will it ever stop raining?

I cut the film into smaller pieces and sealed each glass unit individually, so we can have the windows open.

Switch off the hair drier a few seconds before you think you need to, though, as the film keep shrinking.

I have the film over all the window except for the opening part but it is a very large window.

Sorry! Just saw the rest of your post.

Or will the film help because condensation will not form against the cold glass and therefore stop mould forming on the frames? Condensation still forms unfortunately but maybe mines not sealed perfectly.
If the film stops the draughts and the room is therefore warmer will this offset the humidity and mould issues? You need ventilation and heat, doing one without the other isn't possible long term (dehumidifier would equal ventilation)
And
Will it ever stop raining? No. Never.

Do you have the washing and dehumidifiers in a room with the door shut? The moisture in the bedroom might be coming from the washing. If the bedroom isn't especially humid (any moisture coming from the bathroom?) then adequate ventilation should prevent condensation. If the windows are draughty I would have thought that would be constant ventilation but obviously it isn't enough.

If you seal the whole window, there will still be moisture in the trapped air and that will condense when the window surface is very cold. Plus you won't be able to open the window.

Mould on the back of furniture means you have a more serious issue than just condensation.

Re- just putting film over non-opening parts. That wouldn't solve the draught problem which is through the edges of the windows, where the seal is/should be.
The dehumidifiers do help with humidity but condensation not so much, I'm guessing because a, they are off at night and be there's still the cold window problem.

The washing is in the open plan living room. It can't go in the downstairs loo because that's too small. It can't go in the hallway because no one would be able to get past it to get in or out of the house. It can't go in the upstairs bathroom because no one would be able to use the bathroom without moving the racks out into the hallway first.
I should say various household members are in on different days because of varying shifts and days off so it's also difficult to have the washing in a bedroom. Two of those who would be around in the day tend to spend time in their bedrooms during the day.
Washing on racks is ruling my life at the moment.

Are the bedroom windows double-glazed? And is the condensation forming on the glass panels or the frames? Or the wall next to the frame? Condensation usually only forms on the glass units when it's extremely cold outside. Is it just happening in one room?

I assume there's no chance of getting a tumble dryer? Can the living room be closed off from the hall and stairs? If not, could you try closing the doors of the upstairs rooms while you're drying washing?

The bedrooms are double glazed and the condensation forms on the glass.
The living room cannot be closed off from the stairs or upstairs hall. The downstairs hall is tiny and the washing would fill the space and not allow anyone in or out.
Yes! the bedrooms could have doors shut during the day. That is a possibility.
There isn't much space for a tumble dryer but it's really the cost of electricity that would be the issue with that.

There are four of us in a three bedroom house and each teenage or adult child has a rack each. At the moment two children have a rack of washing on the go and I have two household ones in the living room. The children don't actually wash clothes that often though.
It's a mad amount though isn't it. That'll be what's causing the high humidity and dampness alright. I can't see many alternatives.

“Washing on racks is ruling my life at the moment” Same ! North more to offer watching with interest.

In your situation I think I would only have quick drying items on racks and either use a tumble dryer or use a launderette to dry the other items off, eg sheets, towels, jeans. Thats too much washing in an unforgiving layout.